Machine tool



May l, 1945.

K. McKEE MACHINE Toor..

Filed Aug. 3; 1940 6 Sheets-Sheet l May l, 1945. G. K. McKl-:E I 2,374,874

MACHINE TooL Filed Aug.' :5,-1940 v e sheets-sheet? INVENTOR. GEonqE K. McKEE A TTURNEYI.

May

G. K. MCKEE MACHINE TOOL Filed Aug. 5, l940 s sheets-Sheet s AVTTo RNEY May 1, 1945.

rild Aug. s. 1940 G. K. McKEE MACHINE TOOL INVENTOR. GsoRe'E K MCKEE A TTORN E YI.

Lol.

6 Sheets-Sheet 5 G. K. MCKEE MACHINE TOOL Filed Aug. s, 1940 May 1, 1945.

(I I3l INVENTOR. Geo/res K. McKss May1, 1945. G. K. MCKEE l 2,374,874

- I MACHINE TooL Filed Aug.- 3, 1940 e sheets-sheet 6 INVENTOR. 65ans K. McKee A TTORNEYI.

Patented May 1, 1945 UNITEDv STATES vPATENT ortica `anatrej\ The Avey Drilling Machine Company, Covington, Ky., a corporation of Ohio Application August' s, 1940, serial No. 350,403

` claims. '(ci. 77-5) This invention relates to improvements in a machine tool, and particularly to a drilling machine.

It is one of the chief objects to provide a drilling machine for drilling holes in relatively large area work pieces, such as sheets or plates as `ein-- ployed in aeroplane fuselages, electric generators, and the like. i

Another object is to provide a machine as above referred to which will expeditiously and efficiently cover the large areas to be drilled, whereby all portions of the work may be accessible to the drills.

a machine of the` type aboveindicated, which will traverse the work in all directions, and in which the drilling mechanism is readily secured against f movement during the actual tooling or drilling operation. i

Other objects and advantages of the present invention should be readily apparent by reference' to the following specification, considered in conjunction with the accompanying drawings `forming a part thereof, and it is `to be understood that any modifications may be made in the exact structural details there shown and described,` within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

In the drawings: V Fig. 1 is a side elevation of an embodiment of this invention in a Vdrilling machine; the machine being illustrated as having portions 'of its bed broken away for illustration purposes.

Fig. 2 is a top plan view of the portions of the machine shown in Fig. 1.` Fig. 3 `is an end elevational View of the machine shown in Figs. l and 2, as seen from the left hand end thereof. i.

Fig. 4 is an enlarged, fragmentary, vertical, sectional view, partly in elevation and partly in section, taken on line 4-4 of Fig. 2.

` Fig. 5 is a horizontal, sectionalview, taken on l llll 5--5 0f Fig. 4:.

i Fig. 6 is a fragmentary, vertical, sectional View, taken online 6-6 of Fig. 5. i

- Fig. 'I is an enlarged, fragmentary, sectional view through the drill guide, taken on line `1---1 ofFig. 4. i i l Figu is a horizontalview, partly in elevation and partly in section, taken on line 8-8 of Fig. '7. Fig. 9is` aghorizontal View taken in `a plane below that of Fig. 8, on. line 9-9 of Fig. 7.

Fig; 10 is anenlarged, Vertical, sectional View through the transverse `carriage clamp, taken on line I0-l0 ofFig. 3.

Fig. 1l is ajfragmentary, horizontal, sectional View, taken on line II--I I` of Fig. 10.

Fig. 12 is anenlarged, vertical, sectional View throughanend of the bed, showingits construction, taken on line |2--I2 of Fig. 2, eliminating lthe structure of the'longitudinal carriage.

Fig. 13is a transverse, sectional view through the bed, taken on line I3-I3 of Fig. 12.

` tional view through the longitudinal `carriage clamp operating mechanism, taken on line lit-" l 6 of Fig. 3.v

Fig. 1'7 is a fragmentary, sectional view, taken on line l'l--I'l of Fig. 16. i

Fig. 18 `is an enlarged, fragmentary, vertical, sectional View through the longitudinal carriage clamp, taken on line |8-1-l8 of Fig. 2.

Fig. 19 is a fragmentary, sectional view, taken at right angles to Fig. 18, on line lli-I9 of said Fig. 18.

Fig. 20 is a fragmentary sectional View, taken ina plane ahead of Fig. 18, on line 20--20 of Fig. 19.

Fig.k21 is `an enlarged, fragmentary, vertical,

` sectional view, taken on line 2l--2I of Fig. 2. i

Throughout several views of the'drawings, similar reference characters are employed to "denote the same or similar parts.

, similar articles. At the same time, the machine illustrated is capable of performing this operation in a large number of similar work pieces, that is, a stack of such plates and blades.

The machine in general comprises a supporting bed 25, on which is mounted for longitudinal movement a pair of carriages 26 and 21. Each of the longitudinal carriages has mounted thereon a transverse carriage 2B and 29 which respectively support a drilling head or unit 30 and 3|, as well as auxiliary equipment, such as the carriage locking clamps and their actuating mechanisms, which will later be described in detail. In addition, the bed 25 includes means for positioning and securing the work to be operated upon.

Bed

The bed 25 comprises a pair of longitudinal rail or side members 32 and 33, each of which, near its lower side, is undercut or grooved, as at 34 in Fig. 13, for receiving the opposite ends of cross braces. These cross braces are each substantially identical and indicated in the drawings by the reference numeral 35. The cross braces are U- shaped or channels comprising a body or web portion 36, from the opposite ends of which are the arms 31 and 38, as clearly illustrated in Fig. 12. The ends of the channels are closed by end flanges 39, see Fig. 13. The end anges 39, and abutting portion of the sides or rails 32 and 33, are provided with a plurality of axially aligned countersunk bores 40 for the reception of bolts 4| receiving suitable nuts 42 interiorly of the bed. Secured to the lower brace anges 38,V at appropriate points, shown in the drawings as at the four corners of the bed and centrally of its length, are suitable supporting legs 43. It should be noted that these parts, in addition to being bolted to one another, may be welded for rigidity and strength.

Mounted on the upper brace anges 31 are a plurality of hardwood planks 44, each spaced from the other and each provided at the point where it contacts the transverse braces with a pair of counter bored apertures 45, registering with similar bores in the fiange 31 for the reception of headed bolts 46, such as carriage bolts or the like. Threadedly secured to the bolts 46, below the brace flanges 31, are nuts 41 which hold the parts to one another.

The hardwood planks 44 provide a bed into which the drills bite in penetrating the lowermost piece of work in a stack, as will later be pointed out.

The upper surface or edge of the bed sides or rails is provided with a V-shaped notch 48, into which is laid a round rod 49 serving as a track for grooved wheels on the longitudinal carriages 26 and 21. The track rods 49 are secured in position by means of counter sunk bolts or screws 59, one of which is illustrated in Fig. 14, it being understood that as many of these bolts or screws will be employed, as is considered necessary. The ends of the sides or rails 32 and 33 are each provided with stops 5| and 52 which limit the movement of the longitudinal carriages on their track bars 49. 1n order that an operator may readily get on top of the bed planks 44, or on top of the work sheets thereon, the outermost cross braces 35, see Figs. 3 and 12, are provided with a pair of angle brackets 53 and 54 which have one of their legs bolted or otherwise secured to the web or body 36 and their other legs supporting a stop 55.

Longitudinal carriages The longitudinal carriages 26 and 21 are each identically alike, and it is therefore deemed suicientif but one of them be described in detail. Therefore, the carriage 26, see Figs. 2 and 4, is a relatively shallow rectangular box, open at its upper end, and comprises a base plate 56, to the longitudinal edges of which is welded or otherwise secured upstanding sides or rails 51 and 58. The transverse or remaining edges of the plate 56 has likewise welded or secured thereto ends 59 and 60. Suitable gussets or corner braces 6| are secured or welded in the corners provided by the upstanding sides or rails and the bottom, so as to strengthen these parts and more securely tie them to one another.

Secured to the opposite ends of the sides or rails 51 or 58 are the supporting rollers, which comprise a bracket 62, having a base 63 and an arm 64 projecting therefrom. The said arm is provided with an aperture for a bolt or axle 65 which is held in position by the nut 66. The projecting end of the bolt or axle has mounted thereon a grooved wheel 61, see Figs. 20 and 21. The grooved wheel or roller 61 is connected with its axle 65 by means of an anti-friction roller bearing 68 and a suitable sleeve or bushing. The

.grooved wheel 68 receives the track bars 49 of the b ed sides or rails, and thereby guides the longitidunal carriage in its movement longitudinally in its bed. The bracket arm 64 may have projecting from it a bumper 69 adapted to engage with end stops 52 and 5| in limiting the movements of the carriages. At the same time, and since use is made of two longitudinal carriages on a single bed, these bumpers 69 engage one another to limit the movement of the carriages toward one another.

It will be appreciated that when drilling, the longitudinal carriage should be locked into position, and the carriage is therefore provided with a suitable locking or clamping mechanism. As shown in Figs. 3, 4, 18 and 19, this clamping mechanism comprises a bracket 18, secured to the outer face of one of the longitudinal carriage sides or rails 51 and 58, in which is oscillatably mounted one end of a shaft or bar 1|. The other end of the shaft or bar 1| is provided with a threaded socket 12 receiving the threaded end. 13 of a clamping bolt 14. The bolt 14 passes through axially aligned apertures 15 and 16 in clamping jaws 11 and 18. These jaws are pinned to one another at 19 for relative movement toward and from one another. One of the jaws, namely, 18l is in turn pivotally mounted on a bolt or screw to the longitudinal carriage side or rail 51 or 58. It should also be noted that the bolt 14 is held against rotation movement by any suitable means, such as pin 8| carried by the jaw 18 and extending through a slot or groove in the bolt head 82. The lower ends of the jaws 11 and 18 are thickened as at 83 and 84 to provide gripping means adapted'to engage the sides of the rail at a point below the upper end thereof.

It will readily be appreciated that by rotating or oscillating the shaft or bar 1|, the threaded socket 12 will draw the bolt 14 to the left as seen in Fig. 18, and thereby tend to bring the clamping jaws to one another about the axis of the bolt or screw 80. This relative movement of these parts causes the gripping lingers 83 and 84 to securely grip the sides of the rail and prevent longitudinal movement of the carriage. The means for operating or oscillating the shaft or rod 1| is carried by the transverse carriage, and will be described in detail hereinafter. It should be noted, however, that the shaft or rod 1| is or rail-s 51 .and 5B, similar to the :bed sides or rails .32 and .33, are each. provided with a V-sh-ape'd groove 86 receiving a track bar or rod 8l.` These track bars `are .secured in position by means of .e

counter-sunk bolts or screws 88, one. of Whichlis. illustrated in Fig. '21.

A Cross carriage The cross carriages 28 and A29, `similar .to the longitudinal carriagesd and 21 are substantially identical in construction, as is the mechanisms .carried thereby, and it is therefore deemed sufcient if but one of them be described in detail.

Accordingly, cross carriage 28 is a relatively Vflat cast plate shown in cross section in Fig. 4 and i indicated by .the reference character |39, and this lil B5 and at its other threads for a nut 06. Im-

mediately behind the head 95, there is provided a i bearing 91 for an anti-friction ball bearing 98 carried by a grooved wheel or roller .99 Whichis substantially identical with the grooved wheel or .roller |51, above described. The wheel 99, through its groove, tracks on the track bar 81 for guiding the cross carriage in its movement longitudinally of its longitudinal carriage 25 and 21.

As was l noted above, this wheel supporting mechanism is mounted at each corner of the tri.

angular shaped cross carriage plate, thereby supporting the carriage at three points. l For ease in operation, and to insure the .three point support of the carriage, one of said wheels `or rollers is rollers on the longitudinal carriages are oating.

as in Fig. 20, while the others are fixed as in 2l for the `same reason, to insure proper engagement of the wheels with the track bars on the bed sides or rails andto compensate for possible mis-alignment of these parts. e 1

The cross carriage, similar to the longitudinal carriage, must be clamped or securedinto position on its longitudinal carriage whenatooling or drilling operation-is being performed. For this reason, there is provided, adjacent one `of the wheel mechanisms at the yfront or operating side of the carriage, for exampleA adjacent the left hand wheel mechanism as seenin Fig. 3, a clamp-- ing mechanism indicated in general in the drawings by the reference character This clamp `51 .at a point `below the grooved edge. Pinned thea upper endof the `jaw I05,so as' to have relaftively oscillating movement., is a jaw I0"|xwhose lower end is enlargedat I 08 to engage .with the louter surface of the side` or rail 51 ata `point in opposition to that engagedby the jaw |05. The v jaw |01, at a point intermediate itsthickened portion I08,\and the pivot boltl IM of the jaw |05,

is provided witha plane aperture |09 which is in axiali alignment with a threaded aperture IIll in the jaw |05. Disposed in the apertures |09 and IIO is a clampbolt II I, having alknob` I I2 atY the outer orfree end thereof. i

i It is believed that the operation of this clamping mechanism is self evident, since rotation of the clamp bolt |I in` one direction will tend to urge the jaws toward one another and thereby cause a clamping action between the jaws thickcned or enlarged ends and |08, while rotation of the clamp screw in the.` opposite direction will release said `jaws and thereby` the clamping pressure. i 3

.It should be noted at this time that the mechanisrn for operating the *longitudinal carriage clamping mechanismv is likewise carried by the cross carriage and is located on the carriage adjacent the other forward .guide wheel supporting mechanism, and is indicated in general by the reference character |13 in Fig.,3. This carriage clamping mechanism is shown on an enlarged scale in'Figs. 16 and 17 and comprises a base `member IIll, from which rises a U-shaped arm Iii, so formed as to follow theoutline of the longitudinalfcarriage side or rail 51. At the lower. end of `the outer arm of the bracket II5,

. there is provided a forked bearingor Ifingers IIS and IIl: Disposed between thengers Iland Il? is a sleeve or collar IIB, having secured in its bore a key I|9 adapted to be disposed in the key way or spline 85 provided in the bar or shaft 1|. Projecting from the sleeve or collar |I8 is a lever adapted for oscillating the said collar` .and through its key |I9 oscillating the shaft or rod 11, i i l `The operation of `this mechanism is believed obvious, since the oscillation of the collar IIB in a i counterclockwise direction, as seen in Fig; `16,'will correspondingly operate the shaft or bar 1| thereby, through its threaded socket 12, turn the head 82 of the bolt 'I4 to the left, as seen in Fig.

18, and cause the clamp jaws `|1 and 'I8 to engagethe bed side or rail, It will be noted. from tle above, and particularly from Figs. 2 and` 3, v

thatthe longitudinal and cross carriage clamps are grouped closely adjacent one another, and

as will later be made clear are at all times adjacent the drill feeding mechanism which is carried by the cross carriage for adjustment to the ing mechanism is shown on an enlarged scale` in Figs. 10 and ll and comprises a base Il!! adapted to be bolted to the carriageplate 89 and has upstanding therefrom an outwardly, upwardly inclined arm |02 having a head portion` |03 which overlies the longitudinal carriage side or point of actual tooling or drilling operation.

` Drill driving ami feeding mechanism,

The `drill driving and feeding means, indicated in general by the reference character IZI, is located at the forward side of the cross carl' "riage plate Bt substantially centrally thereof. as

seen in Fig. 2, and inbetween the longitudinal carriage clamp mechanism and the cross carriage clamp mechanism |00, as seen in Fig. 3.

This mechanism is illustrated on an enlarged scale in Figs. 4,' 5 and 6. and comprises an upstandiiu;` column |22 having a ybase |23 adapted for bolting the column to the carriage plate 89.

The upper end of the column |22 is outwardly `disposed and provided with a housing |24 adapted to overliethe longitudinal carriage rail `5`| and .project outwardly thereof. Secured within the housing 24 is the motor eld laminations |25 encircling the armature laminations |26 which carry the motor shaft |21. The motor shaft |21 is journaled at its lower end in an anti-friction bearing carried by a closure plate |28, while the upper end of the shaft is journaled in antifriction bearings supported by a gear case or housing |29. The motor shaft |21, betweenthe armature |26 and its bearings, is provided with fans |38 and |3| adapted to circulate air through the motor for cooling purposes.

Disposed within the gear housing |29 is a shaft |32, shown as an extension of the motor shaft |21, which is provided longitudinally thereof with a key |33. Slidably mounted on the shaft |32 is a gear cluster comprising three pinions |34, |35 and |36, each provided with a spline or key Way receiving the key |33 of the shaft |32. The upper end of the shaft |32 is journaled in an anti-friction ball bearing carried by a closure cap |31.

Within the gear housing |29, and parallel with the shaft |32, is a driven sleeve |38 journaled in anti-friction bearings provided by the closure cap |31 and gear housing |29. Keyed or otherwise secured to the sleeve |38 are three spur gears |39, |40 and |4|, adapted respectively to be meshed with the pinions |34, |45 and |36.

The sleeve |38 projects through the column housing |24 and has its lower end journaled in an anti-friction ball bearing supported by the closure plate |28. The sleeve |38 is provided interiorly thereof with one or more keys received in a spline |42 in spindle |43.

The spindle |43, in addition to being journaled in the sleeve |38 is journaled in suitable antifriction bearings carried by a quill |44, and the spindle below the quill has secured to it a drill mounting chuck |45. The quill |44 is mounted against rotation, but for sliding movement in a bearing |46 at the forward end of an adjustable bracket |41 having the usual dove-tail connection with the dovetail guide |48 in the forward face of the column 22. The bracket |41 is adapted to be vertically adjusted relative to the guide |48 and secured in adjusted positions by suitable clamp means, such as clamping bolts |49. In order to effect the adjustment of the quill |44 relative to the bearing |46, the bracket |41 has jcurnaled transversely thereof a shaft |58 Ahaving secured thereto, within a cavity in said bracket, a rack pinion |52 which meshes with a suitable rack |53 bolted or otherwise secured to the quill 44. In order to rotate the shaft |58 and ltherefore the pinion |52, the outer end of said shaft is provided with a suitable hand wheel |54. sheathing and journalling the shaft |58 between the hand wheel |54 and bracket |41 is a sleeve |55, see Fig'. 3.v In order to assist in the vertical movement of the quill |44 and parts carried thereby, the upper end of the quill |44 has projecting from it an arm |56 to which is pivotally connected one end of a chain or cable |51 which passes over idler pulleys |58 and |59. The idler pulley |58 is journaled in a bracket |60 secured to or integral with and depending from the closure plate |28, while the idler pulley |59 is journaled interiorly of the upright or column |22. The other end of the chain or cable |51, and within the column |22, has secured thereto a counter weight |6| The rear of the upright or column |22 is provided with a box |62 containing the usual elec-- trical equipment, such as switches, relays, fuses and the like, usual in machine tools for operating and safeguarding electrical motors. The box |62 is closed by a cover |63, and projecting from this box are suitable, flexible, electrical cables extending to the electric source, whereby the drill rotating and feeding mechanisms may cover the entire surface of the bed due to the movements relative thereto of the longitudinal carriages 26 and 21 and cross carriages 28 and 29. In order to effect the operation and control of the electric motor, suitable switches, see Fig. 3, are mounted at the forward end of the bracket |41 and are indicated by push buttons carrying reference character |64.

It will be appreciated that the 'gears in the gear box |29 constitute a change speed mechanism effected by the connection of the various gear pinions |34, |35 and |36 with their respective fixed gears |39, |48 and |4|. In order to shift the gear pinions, use is made of a shifter fork |65 embracing the said pinions byhaving one of its arms |66 lying on the upper surface of the pinion |34 and the other arm |61 lying below the pinion |35. The fork |65 is integral with a rod |63 which has its lower end hollow and receiving guide pin or bar |69. The upper end of the shifter rod |68 is provided with a slot |10 receiving shifter pin 1| at the free endof a lever |12. The lever |12 is pinned or otherwise secured to the end of a rock shaft 13, oscillatably journaled in a bearing |14 formed integral with a bracket |15 mounted on the upper surface of closure cap |31. The other end of the rock shaft |13 has pinned or otherwise secured to it the operating lever |16.

It is believed that the operation of this mechanism is well understood, since the movement of the lever |16 from the position shown in Fig. 6 to the right will elevate the pinions, disengaging the pinion |36 from gear |4| and sequentially meshing pinion |35 with gear |49 and pinion |34 with gear |39, for thereby changing the ratio between the motor shaft extension |31 and driven sleeve |38 to change the speed of rotation of the spindle |43.

Drill guide and work locating mechanism Secured to the spindle chuck |45 is a drill guiding mechanism, illustrated on an enlarged scale in Figs. '1, 8 and 9, and comprises a bracket |11 having a plate portion 18 adapted to engage the under surface of the chuck |45, and these parts attached to one another by screws |19. Depending from opposite ends of the plate member |18 are arms |88 and |8I. The arms |80 and |8| are respectively axially bored, as at |82 and |83, with a shoulder |84 between said bores. Mounted in the bores in the arms are pins |85 and |86, each having their lower ends threaded as at |81 and their upper ends enlarged to provide heads |88 adapted to engage the shoulders |84. The upper ends of the bores |82 are closed by plugs |89 and |98, which act as abutments for the upper ends of coil springs |9| and |92, which abut on their other ends with the heads |88 of pins |85 and |85. The lower threaded ends |81 of the pins |85 and |86 are screwed into tapped apertures at the ends of a bar |93 which is provided centrally thereof with a bore |94 for a removable drill guiding bushing 85.

Secured to the spindle |43, between the arms |88 and |8|, is a drill chuck |96, adapted to have secured thereinto the usual drill |91. As will be seen in Fig. 7, the drill chuck |96 is in axial aligna'svae'm ment with the bushing lss-s that the arm 191. is

guided by the said' bushing 'during its yvertical movements and `drilling operation.`

Positioned' on top of the wood planks 44, which in effect is the work supporting table, is a stack of work sheets or` plates, indicated by the refer-" ence character |98. Disposed on top` ofthe stack holes clamping linger 2158i, while the tail piece 2|9 projects to the other side thereof. 'I'hreadedv through `thetai-l piece 22W is the clamp screw 220 having thework stack and templet relative to the bed, and which means are shown in plan in Fig. 2 as l located along the left han-d edgeandupper edge thereof.` These `positioning `and clamping" means are shownon an enlarged scale in Figs. 12", 123, 14' and 15, and which show, forthe upper end ofthe work in Figs. 12 and 125,the end cross channel 36` as being provided with anoutwardly projectexample, are blocks 24, each having'a vertical face 205 in alignment with oneanother. These faces 205 constitute stops forpositioning 1the upper end of the work pieces andV templet, as seen in Fig. 2. In addition, the blocksZIJll` are each provided with an aperture in axial alignment with one anotherlfor a shaft or rcel` 206; The

shaft or rod 206 is employed for supporting.

clamps for securing the work in` position as determined' by the stop blocks 200.

One ofthe clamps is'illustrated in cross section in Fig. l2, and comprises a clamping: mem

ber having an enlarged body portionw201,from

one side of which projects a clampingnger 213B, while from the other side-projects a tail 209; Threaded through the tail 209 is .fa clamping screw 2I0`, provided, on its upper surface@y with a knob 2 li. The enlarged body portion 20T is provided with an aperture ,2-lf2` for freely receiving the rod or bar 206". t

The operation of the-clamp is readily apparer'lt,f

since rotation of the clamp screw 2l0 in Aa direction to elevate the tail 20,9" depresses'the finger 208', thereby gripping the work -plates `|98 and templet |99 between the clamp fingerv and the planks 94, and reverse operation of thescrew 2|0 positively lowers the tail 209 and elevates the linger 208,

pieces and templet is eiectedthe same as that above described, and as ill'ustratedinV Figs. 13 and I4', comprises a flat bar or plate 2|3 which ex tendsV longitudinally of the bed and is bolted, welded or otherwisesecured to the transverse brace channels 35. are a plurality of blocks 2|"4 similar in all` respects to the blocks 294, and each comprising a vertical face 2|5 in alignment with one another.

*Theoperation` 'of this clamping mechanism is identical with that above described, namely, rotation ot the clamp screw 220 in one direction actuates the clamping finger in a counterclockwise direction, Vseen in Fig. 113i, for clamping the work againstthe plankslll, While reverse rotation olf the `screw 220 reversely actuates thenger 2 F8;

l Operation Theoperation of this machine, as illustrated in the drawings, is: the longitudinal carriages are moved to one end ofthe bed 25 andi the `work pieces slid;` onto the bed planks; 4 4 beneath these carriages', with their` one edge against the faces 20,5r olf the blocks 204i andtheir'other edge against the.` iaces 2|@` of the blocks -2.|'4'. It will be readily understood;` that the; work pieces |98 may vary innumber from oneto the: full capacity of the stack as determined by the clamps and positioning stop blocks.` On top` ofthe work, isthen the templetl |99 `and alt ortheseparts secured to one another and to the bed4 planks ISM byY operating "the: clampy armsw The longitudinal carriages. and? 21 are then positioned at their` proper starting point` on the I bed 25. which is of course effected manually by grasping; the same4 and shitting themon the bed sides'or track bars 429 and' the antifriction rollers or wheels 65| and' $l9.`V The! longitudinal carriages; are. `then secured in position, through ,the` operation` of' the" handle |204 for actuating clamlpl shoesy Nrandf 'w toward one` another and gripping one of said bedf sides or rails. The cross carriagesw and29 are then shifted to the desired position on, the longitudinali carriage, again manually by grasping same and moving them relative to the guide track bars 81 through the medium 'of the rollers or wheels 61 and 99. The cross carps5 The side positioning andclarnping of the WorlcA Mounted on the plate 2 |f3l The blocks 2|4 are each provided with a bore in axial alignment with one another, in which is` riages are then secured in position by `actuating the-clamp screw ||i| toactuate clamp jaws F06 andi Milf toward one another and engage' one of the longitudinal carriage guides or rails 51 and 58.`

drill spindlel andA drill is then rotatedA I through` the operation of the switch |64 and the- `drill.2 fedf toward the workthrough the bandi Wheel |:54.. The: movement of `the hand wheel |*5'4 causes the descent of the quill le and parts carbracket and: drill` continuel their descent to eliect the drilling ortooling of the work |90. The stopping or the bar |93 correspondingly stops the descemfoll the pins,` and`|86` which causes a compressionof' the springs |191 and |92 during the drilling operation, lwhich spring, upon reversemailement-o't'thev parts, exandsuntilthepin heads' lllllll engage the' shoulders |94; whereuponthey moveupwardly along' with the bar F95. It will be noted that with this constructionthe' drill guide bushing |95 is at all times guiding and supporting the drill during its operation and is adjacent the work, so as to afford the drill its maximum support during the drilling.

As each hole is drilled, or each tooling operation is completed, one or both of the carriage clamps is released, and the drill advanced to the next station or point of operation, Whereu'ponthe carriages are again secured andthe drilling or tooling done. These operations are'repeated until the work piece is completed, whereupon the work clamps are released and the finished work replaced with unfinished work.

In order to take care of the thrust on the drill during the drilling operation, and since the cross carriage is mounted for free movement on the longitudinal carriage, means are provided for conteracting this drill thrust. This means comprises the securing to the inner surface of the longitudinal carriage side or rail 51 a bar 222, beneath which is the nose 223 of a thrust 224, bolted, welded or otherwise secured to the forward face of the drill upright column |22 and the adjacent upper surface of the carriage plate 89, all as shown in Fig. 4. From this it will be readily seen that the tendency, due to tooling or drilling pressure, to lift the drill and thereby the carriage and carriage plate 89, will be effected.

From the foregoing, it is believed' now evident that there has been provided a drilling machine for accomplishing the objects initially set forth.

What is claimed is:

1. In a drilling machine of the class described, the combination of a rectangular bed having sides and cross braces between said sides, a circular guide bar secured to the upper edge of each side, a longitudinal carriage having grooved guide wheels at substantially each corner of the 1ongitudinal carriage engaging the guide bar for supporting and guiding said longitudinal carriage during its movement on the guide bars, a clamp mechanism for securing the longitudinal carriage to the bed at any point in its adjustment longitudinally thereof, comprising a pair of clamp jaws mounted on the longitudinal carriage for oscillatory movement toward and from one another and respectively located on opposite sides of one bed side, and a clamping screw for urging the clamp jaws toward one another to engage said bed side at a point just below the guide bar thereon.

2. In a drilling machine of the class described, the combination of a rectangular bed having sides and cross braces between said sides, a circular guide bar secured to the upper edge of each side, a longitudinal carriage having grooved guide wheels at substantially each corner of the longitudinal carriage engaging the guide bar for supporting and guiding said longitudinal carriage during its movement on the guide bars, a clamp mechanism for securing the longitudinal carriage to the-bed at any point in its adjustment longitudinally thereof, comprising a pair of clamp jaws mounted on the longitudinal carriage for oscillatory movement toward and from one another and respectively located on opposite sides of one bed side, a clamping screw for urging the clamp jaws toward one another to engage said bed side at a point just below the guide bar thereon, a drilling unit on the longitudinal carriage for movement therewith relative to the bed and movement thereon longitudinally thereof, and clamp operating means associated with the drill unit and movable therewith relative to the longitudinal carriage.

3. In a drilling machine of the class described, the combination of a rectangular bed having sides and cross braces between said sides, a circular guide bar secured to the upper edge of each side, a longitudinal carriage having grooved guide wheels at substantially each corner of the longitudinal carriage engaging the guide bar for supporting and guiding said longitudinal carriage during its movement on the guide bars, a lclamp mechanism for securing the longitudinal carriage to the bed at any point in its adjustment longitudinally thereof, comprising a pair of clamp jaws mounted on the longitudinal carriage for oscillatory movement toward and from4 one another and respectively located on opposite sides of one bed side, a clamping screw for urging the clamp jaws toward one another to engage said bed side at a point just below the guide bar thereon, a drilling unit on the longitudinal carriage for movement therewith relative to the bed and movement thereon longitudinally thereof, a clamp operating means associated with the drill unit and movable therewith relative to the longitudinal carriage, including an oscillatable bar oscillatably journaled on the carriage and having a threaded socket at one end for the clamp screw, and an oscillating handle splined to the oscillatable bar and axially movable relative thereto with the drill unit.

4, In a drilling machine of the class described, the combination of a rectangular bed, a carriage mounted thereon for longitudinal movement relative thereto, said carriage including sides or rails, circular guide bars at the upper edge of the sides or rails, a cross carriage having grooved guide wheels at opposite sides thereof for engaging the guide bars for guiding the cross carriage relative to the longitudinal carriage, a drill rotating and feeding unit carried by the cross carriage, `clamping means for 'securing the cross carriage in adjusted positions, comprising a bracket upstanding from and overlying one of the longitudinal carriage rails, a pair of clamping jaws pivotally mounted on the bracket and located one on each side of the rail, and a clamping screw for urging said jaws toward one another to clampingly engage the rail.

5. In a drilling machine, the combination of a. bed having rails extending longitudinally thereof, a first carriage mounted on said rails for movement thereon longitudinally of the bed, guide rrails on said first carriage extending transversely of the bed, a second carriage mounted on the rst carriage rails for movement thereon transversely of the bed, a self contained drill rotating and feeding unit on the second carriage and movable with said second carriage and first carriage relative to the bed, clamping means on said second carriage for securing same to the first carriage in adjusted positions, clamping means on the first carriage for securing same in adjusted positions, and operating means for said first carriage clamping means carried by said second carriage.

GEORGE K. MCKEE. 

